package com.spzx.cart.service.impl;

import com.spzx.cart.api.domain.CartInfo;
import com.spzx.cart.service.ICartService;
import com.spzx.common.core.constant.SecurityConstants;
import com.spzx.common.core.context.SecurityContextHolder;
import com.spzx.common.core.domain.R;
import com.spzx.common.core.exception.ServiceException;
import com.spzx.common.security.utils.SecurityUtils;
import com.spzx.product.api.RemoteProductService;
import com.spzx.product.api.domain.ProductSkuVo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundHashOperations;
import org.springframework.data.redis.core.HashOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * @version 1.0
 * @Author 马冰
 * @Date 2025/3/3 19:29
 * @注释
 */
@Service
@Slf4j
public class CartServiceImpl implements ICartService {

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private RemoteProductService remoteProductService;

    private String getCartKey(Long userId){
        //定义key user:userId:cart
        return "user:cart:" + userId;
    }


    @Override
    public void addToCart(Long skuId, Integer skuNum) {
        //获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();
        //1.构建“用户”购物车hash结构key user:cart:用户ID
        String cartKey = getCartKey(userId);
        //2.创建Hash结构绑定操作对象(方便对hash进行操作)
        BoundHashOperations<String, String, CartInfo> hashOps = redisTemplate.boundHashOps(cartKey);
        //3.判断用户购物车中是否包含该商品，如果包含：数量进行累加：新增购物车商品
        String hashKey = skuId.toString();
        //上限为99
        Integer threshold = 99;
        if (hashOps.hasKey(hashKey)) {
            //说明该商品在购物车中已有，对数量进行累加，不能超过指定上限99
            CartInfo cartInfo = hashOps.get(hashKey);
            int totalCount = cartInfo.getSkuNum() + skuNum;
            cartInfo.setSkuNum(totalCount > threshold ? threshold : totalCount);
            hashOps.put(hashKey, cartInfo);
        } else {
            //判断购物车商品种类(不同SKU)总数大于50件
            Long count = hashOps.size();
            if (++count > 50){
                throw new RuntimeException("商品种类数量超过上限！");
            }
            //说明购物车没有该商品，构建购物车对象，存入Redis
            CartInfo cartInfo = new CartInfo();
            cartInfo.setUserId(userId);
            cartInfo.setSkuNum(skuNum > threshold ? threshold : skuNum);
            //远程调用商品服务获取商品sku基本信息
            R<ProductSkuVo> productSkuResult = remoteProductService.getProductSku(skuId, SecurityConstants.INNER);
            if (R.FAIL == productSkuResult.getCode()) {
                throw new ServiceException(productSkuResult.getMsg());
            }
            ProductSkuVo productSku = productSkuResult.getData();
            cartInfo.setSkuId(skuId);
            cartInfo.setSkuName(productSku.getSkuName());
            cartInfo.setThumbImg(productSku.getThumbImg());
            cartInfo.setCartPrice(productSku.getSalePrice());
            cartInfo.setSkuPrice(productSku.getSalePrice());
            cartInfo.setCreateTime(new Date());

            //将购物车商品存入Redis
            hashOps.put(hashKey, cartInfo);
        }
    }

    @Override
    public List<CartInfo> getCartList() {
        //获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = this.getCartKey(userId);
        //获取数据
        BoundHashOperations<String, String, CartInfo> hashOps = redisTemplate.boundHashOps(cartKey);
        List<CartInfo> cartInfoList = hashOps.values();
        if(!CollectionUtils.isEmpty(cartInfoList)) {
            List<CartInfo> infoList = cartInfoList.stream()
                    //降序
                    .sorted((o1, o2) -> o2.getCreateTime().compareTo(o1.getCreateTime()))
                    .collect(Collectors.toList());
            return infoList;
        }
        return new ArrayList<>();
    }

    @Override
    public void deleteCart(Long skuId) {
        //获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = getCartKey(userId);
        //获取缓存对象
        BoundHashOperations<String, String, CartInfo> hashOps = redisTemplate.boundHashOps(cartKey);
        hashOps.delete(skuId.toString());
    }

    @Override
    public void checkCart(Long skuId, Integer isChecked) {
        //获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();
        //修改缓存
        String cartKey = this.getCartKey(userId);
        BoundHashOperations<String, String, CartInfo> hashOps = redisTemplate.boundHashOps(cartKey);
        //先获取用户选择的商品
        if (hashOps.hasKey(skuId.toString())) {
            CartInfo cartInfoUpd = hashOps.get(skuId.toString());
            //cartInfoUpd 写回缓存
            cartInfoUpd.setIsChecked(isChecked);
            //更新缓存
            hashOps.put(skuId.toString(), cartInfoUpd);
        }
    }

    @Override
    public void allCheckCart(Integer isChecked) {
        //获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = getCartKey(userId);
        BoundHashOperations<String, String, CartInfo> hashOps = redisTemplate.boundHashOps(cartKey);
        List<CartInfo> cartInfoList = hashOps.values();
        cartInfoList.forEach(item ->{
            CartInfo cartInfoUpd = hashOps.get(item.getSkuId().toString());
            cartInfoUpd.setIsChecked(isChecked);
            //更新缓存
            hashOps.put(item.getSkuId().toString(), cartInfoUpd);
        });
    }

    @Override
    public void clearCart() {
        //获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = this.getCartKey(userId);
        //获取缓存对象
        redisTemplate.delete(cartKey);
    }

    @Override
    public List<CartInfo> getCartCheckedList() {
        //获取购物车key
        Long userId = SecurityUtils.getUserId();
        String cartKey = getCartKey(userId);
        HashOperations<String, String, CartInfo> hashOps = redisTemplate.opsForHash();
        List<CartInfo> cartInfoList = hashOps.values(cartKey);
        if(!CollectionUtils.isEmpty(cartInfoList)) {
            cartInfoList = cartInfoList
                    .stream()
                    .filter(cartInfo -> cartInfo.getIsChecked() == 1)
                    .collect(Collectors.toList());
        }
        return cartInfoList;
    }
}
